Publications

@article{BelHajFrej2020b,

title = {Fractional interval observers and initialization of fractional systems},

author = {Ghazi Bel Haj Frej and Rachid Malti and Mohamed Aoun and Tarek Ra\"{i}ssi},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073555836\&doi=10.1016%2fj.cnsns.2019.105030\&partnerID=40\&md5=79ed72482fa1874d673190eaeaf76737},

doi = {10.1016/j.cnsns.2019.105030},

year  = {2020},

date = {2020-01-01},

journal = {Communications in Nonlinear Science and Numerical Simulation},

volume = {82},

abstract = {In this paper an interval observer is synthesized for fractional linear systems with additive noise and disturbances. The contribution of system whole past to future output is taken into account as an initialization function. Provided the initialization function is upper and lower bounded, it is shown in this paper that the fractional interval observer (FIO) allows to bound pseudo-state free responses by an upper and a lower trajectory. In case interval observers cannot be synthesized straightforwardly, so as to obtain a stable and non-negative estimation error, it is shown that a change of coordinates allows to overcome this problem. The proposed methodology allows to bound fractional systems trajectories when the whole past is unknown but can be bounded. Finally, a numerical example is given to show the effectiveness of the proposed methods on the initialization of fractional linear systems. © 2019 Elsevier B.V.},

note = {Cited by: 6; All Open Access, Bronze Open Access, Green Open Access},

keywords = {A-stable, Additive noise, Estimation errors, Fractional systems, Free response, Initialization, Interval observers, Linear systems, Non negatives, Numerical methods, Pseudo state},

pubstate = {published},

tppubtype = {article}

}

@article{BelHajFrej2020c,

title = {Fractional interval observers and initialization of fractional systems},

author = {Ghazi Bel Haj Frej and Rachid Malti and Mohamed Aoun and Tarek Ra\"{i}ssi},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073555836\&doi=10.1016%2fj.cnsns.2019.105030\&partnerID=40\&md5=79ed72482fa1874d673190eaeaf76737},

doi = {10.1016/j.cnsns.2019.105030},

year  = {2020},

date = {2020-01-01},

journal = {Communications in Nonlinear Science and Numerical Simulation},

volume = {82},

abstract = {In this paper an interval observer is synthesized for fractional linear systems with additive noise and disturbances. The contribution of system whole past to future output is taken into account as an initialization function. Provided the initialization function is upper and lower bounded, it is shown in this paper that the fractional interval observer (FIO) allows to bound pseudo-state free responses by an upper and a lower trajectory. In case interval observers cannot be synthesized straightforwardly, so as to obtain a stable and non-negative estimation error, it is shown that a change of coordinates allows to overcome this problem. The proposed methodology allows to bound fractional systems trajectories when the whole past is unknown but can be bounded. Finally, a numerical example is given to show the effectiveness of the proposed methods on the initialization of fractional linear systems. © 2019 Elsevier B.V.},

note = {Cited by: 6; All Open Access, Bronze Open Access, Green Open Access},

keywords = {A-stable, Additive noise, Estimation errors, Fractional systems, Free response, Initialization, Interval observers, Linear systems, Non negatives, Numerical methods, Pseudo state},

pubstate = {published},

tppubtype = {article}

}

@article{FREJ2019,

title = {Fractional Interval Observers And Initialization Of Fractional Systems},

author = {Ghazi Bel Haj Frej and Rachid Malti and Mohamed Aoun and Tarek Ra\"{i}ssi},

url = {http://www.sciencedirect.com/science/article/pii/S1007570419303491},

doi = {https://doi.org/10.1016/j.cnsns.2019.105030},

issn = {1007-5704},

year  = {2019},

date = {2019-01-01},

journal = {Communications in Nonlinear Science and Numerical Simulation},

pages = {105030},

abstract = {In this paper an interval observer is synthesized for fractional linear systems with additive noise and disturbances. The contribution of system whole past to future output is taken into account as an initialization function. Provided the initialization function is upper and lower bounded, it is shown in this paper that the fractional interval observer (FIO) allows to bound pseudo-state free responses by an upper and a lower trajectory. In case interval observers cannot be synthesized straightforwardly, so as to obtain a stable and non-negative estimation error, it is shown that a change of coordinates allows to overcome this problem. The proposed methodology allows to bound fractional systems trajectories when the whole past is unknown but can be bounded. Finally, a numerical example is given to show the effectiveness of the proposed methods on the initialization of fractional linear systems.},

keywords = {Fractional systems, Initialization, Interval observers, scopus, Stability of fractional linear systems},

pubstate = {published},

tppubtype = {article}

}